test/debug/ncptrace.c

   1 /*
   2  * NCPTRACE.C
   3  *
   4  * cc -I/usr/src/sys ncptrace.c -o /usr/local/bin/ncptrace -lkvm
   5  *
   6  * ncptrace
   7  * ncptrace [path]
   8  *
   9  * Trace and dump the kernel namecache hierarchy.  If a path is specified
  10  * the trace begins there, otherwise the trace begins at the root.
  11  *
  12  *
  13  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
  14  *
  15  * This code is derived from software contributed to The DragonFly Project
  16  * by Matthew Dillon <dillon@backplane.com>
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  *
  22  * 1. Redistributions of source code must retain the above copyright
  23  *    notice, this list of conditions and the following disclaimer.
  24  * 2. Redistributions in binary form must reproduce the above copyright
  25  *    notice, this list of conditions and the following disclaimer in
  26  *    the documentation and/or other materials provided with the
  27  *    distribution.
  28  * 3. Neither the name of The DragonFly Project nor the names of its
  29  *    contributors may be used to endorse or promote products derived
  30  *    from this software without specific, prior written permission.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  35  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  36  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  37  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  38  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  39  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  40  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  41  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  42  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  43  * SUCH DAMAGE.
  44  *
  45  * $DragonFly: src/test/debug/ncptrace.c,v 1.6 2005/03/24 21:15:11 dillon Exp $
  46  */
  47
  48 #define _KERNEL_STRUCTURES
  49 #include <sys/param.h>
  50 #include <sys/user.h>
  51 #include <sys/malloc.h>
  52 #include <sys/signalvar.h>
  53 #include <sys/vnode.h>
  54 #include <sys/namecache.h>
  55
  56 #include <vm/vm.h>
  57 #include <vm/vm_page.h>
  58 #include <vm/vm_kern.h>
  59 #include <vm/swap_pager.h>
  60 #include <vm/vnode_pager.h>
  61
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <fcntl.h>
  66 #include <kvm.h>
  67 #include <nlist.h>
  68 #include <getopt.h>
  69
  70 struct nlist Nl[] = {
  71     { "_rootncp" },
  72     { NULL }
  73 };
  74
  75 void kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes);
  76 void dumpncp(kvm_t *kd, int tab, struct namecache *ncptr, const char *path);
  77
  78 main(int ac, char **av)
  79 {
  80     struct namecache *ncptr;
  81     kvm_t *kd;
  82     const char *corefile = NULL;
  83     const char *sysfile = NULL;
  84     int ch;
  85     int i;
  86
  87     while ((ch = getopt(ac, av, "M:N:")) != -1) {
  88         switch(ch) {
  89         case 'M':
  90             corefile = optarg;
  91             break;
  92         case 'N':
  93             sysfile = optarg;
  94             break;
  95         default:
  96             fprintf(stderr, "%s [-M core] [-N system]\n", av[0]);
  97             exit(1);
  98         }
  99     }
 100     ac -= optind;
 101     av += optind;
 102
 103     if ((kd = kvm_open(sysfile, corefile, NULL, O_RDONLY, "kvm:")) == NULL) {
 104         perror("kvm_open");
 105         exit(1);
 106     }
 107     if (kvm_nlist(kd, Nl) != 0) {
 108         perror("kvm_nlist");
 109         exit(1);
 110     }
 111     kkread(kd, Nl[0].n_value, &ncptr, sizeof(ncptr));
 112     if (ac == 0) {
 113         dumpncp(kd, 0, ncptr, NULL);
 114     } else {
 115         for (i = 0; i < ac; ++i) {
 116             if (av[i][0] != '/')
 117                 fprintf(stderr, "%s: path must start at the root\n", av[i]);
 118             dumpncp(kd, 0, ncptr, av[i]);
 119         }
 120     }
 121 }
 122
 123 void
 124 dumpncp(kvm_t *kd, int tab, struct namecache *ncptr, const char *path)
 125 {
 126     struct namecache ncp;
 127     struct namecache *ncscan;
 128     const char *ptr;
 129     int haschildren;
 130     char name[256];
 131
 132     kkread(kd, (u_long)ncptr, &ncp, sizeof(ncp));
 133     if (ncp.nc_nlen < sizeof(name)) {
 134         kkread(kd, (u_long)ncp.nc_name, name, ncp.nc_nlen);
 135         name[ncp.nc_nlen] = 0;
 136     } else {
 137         name[0] = 0;
 138     }
 139     if (tab == 0) {
 140         strcpy(name, "ROOT");
 141         if (path)
 142             ++path;
 143     } else if (ncp.nc_flag & NCF_MOUNTPT) {
 144         strcpy(name, "MOUNTGLUE");
 145     } else if (name[0] == 0) {
 146         strcpy(name, "?");
 147         if (path)
 148             return;
 149     } else if (path) {
 150         if ((ptr = strchr(path, '/')) == NULL)
 151             ptr = path + strlen(path);
 152         if (strlen(name) != ptr - path ||
 153             bcmp(name, path, ptr - path) != 0
 154         ) {
 155             return;
 156         }
 157         path = ptr;
 158         if (*path == '/')
 159             ++path;
 160         if (*path == 0)
 161             path = NULL;
 162     }
 163
 164     if (ncp.nc_list.tqh_first)
 165         haschildren = 1;
 166     else
 167         haschildren = 0;
 168
 169     if (path)
 170         printf("ELM ");
 171     else
 172         printf("%*.*s%s ", tab, tab, "", name);
 173     printf("[ncp=%p par=%p %04x vp=%p",
 174             ncptr, ncp.nc_parent, ncp.nc_flag, ncp.nc_vp);
 175     if (ncp.nc_timeout)
 176         printf(" timo=%d", ncp.nc_timeout);
 177     if (ncp.nc_refs)
 178         printf(" refs=%d", ncp.nc_refs);
 179     if ((ncp.nc_flag & NCF_UNRESOLVED) == 0 && ncp.nc_error)
 180         printf(" error=%d", ncp.nc_error);
 181     if (ncp.nc_exlocks)
 182         printf(" LOCKED(%d,td=%p)", ncp.nc_exlocks, ncp.nc_locktd);
 183     printf("]");
 184
 185     if (path) {
 186         printf(" %s\n", name);
 187     } else {
 188         printf("%s\n", haschildren ? " {" : "");
 189     }
 190     for (ncscan = ncp.nc_list.tqh_first; ncscan; ncscan = ncp.nc_entry.tqe_next) {
 191         kkread(kd, (u_long)ncscan, &ncp, sizeof(ncp));
 192         dumpncp(kd, (path ? (tab ? tab : 4) : tab + 4), ncscan, path);
 193     }
 194     if (haschildren && path == NULL)
 195         printf("%*.*s}\n", tab, tab, "");
 196 }
 197
 198 void
 199 kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes)
 200 {
 201     if (kvm_read(kd, addr, buf, nbytes) != nbytes) {
 202         perror("kvm_read");
 203         exit(1);
 204     }
 205 }
 206